I have not seen the front of this carte de visite but the back is
interesting, and, in my experience unusual, in showing:
"Under the distinguished patronage of
Reproduced by courtesy of
The number on the back of the carte de visite above is high.
This suggests that the photograph was taken at a fairly late date.
The Howie studio was based at 60 Princes Street, sometimes described
as 60b Princes Street for 26 years beginning 1864: